// message_server.h

/*    Copyright 2009 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

/*
  abstract database server
  async io core, worker thread system
 */

#pragma once

#include "mongo/pch.h"

namespace mongo {

    struct LastError;

    class MessageHandler {
    public:
        virtual ~MessageHandler() {}
        
        /**
         * called once when a socket is connected
         */
        virtual void connected( AbstractMessagingPort* p ) = 0;

        /**
         * called every time a message comes in
         * handler is responsible for responding to client
         */
        virtual void process( Message& m , AbstractMessagingPort* p , LastError * err ) = 0;

        /**
         * called once when a socket is disconnected
         */
        virtual void disconnected( AbstractMessagingPort* p ) = 0;
    };

    class MessageServer {
    public:
        struct Options {
            int port;                   // port to bind to
            std::string ipList;             // addresses to bind to

            Options() : port(0), ipList("") {}
        };

        virtual ~MessageServer() {}
        virtual void run() = 0;
        virtual void setAsTimeTracker() = 0;
        virtual void setupSockets() = 0;
    };

    // TODO use a factory here to decide between port and asio variations
    MessageServer * createServer( const MessageServer::Options& opts , MessageHandler * handler );
}
